| Discovery | |
|---|---|
| Discovered by | Santoset al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics | |
| Apastron | 2.24 AU (335,000,000 km) |
| Periastron | 1.31 AU (196,000,000 km) |
| 1.78 AU (266,000,000 km)[1] | |
| Eccentricity | 0.26 ± 0.06[1] |
| 956 ± 14[1]d 2.62y | |
Averageorbital speed | 20.3 |
| 2,453,631 ± 30[1] | |
| 177 ± 12[1] | |
| Semi-amplitude | 8.4 ± 0.4[1] |
| Star | HD 181720 |
HD 181720 b is anextrasolar planet which orbits theG-typemain sequencestarHD 181720, located approximately 190light years away in theconstellationSagittarius. This planet has at least three-eighths the mass ofJupiter and takes over two and five-eighths years to orbit the star at asemimajor axis of 1.78AU with aneccentricity of 0.26.[1] This planet was detected byHARPS on October 19, 2009, together with 29 other planets.
The planet HD 181720 b is namedToge. The name was selected in theNameExoWorlds campaign byGhana, during the 100th anniversary of theIAU. Toge meansearring in theEwe language.[2][3]
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